单项选择题

A 28 years-old gravida, 39 gestational weeks, in labor, birth process successfully, fetal heart sound changed to 100bpm suddenlly when cervix dilatated 250px. Which treatment was not good?
A、oxygen update
B、Looking for reasons positively 
C、termination of pregnancy as soon as possible 
D、cesarean section immediately. 
E、left lateral position

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